Elongated tilting hearth furnace



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Patented May 3, 1932 HERMANN MASCHMEYER, OF BAD EMS, GERMANY ELONGA'IED TILTING HEARTH FURNACE Application filed October 24, 1930, Serial No.

This invention relates to an elongated tiling hearth furnace of the drum furnace type, in which the fire is situated at the one end and the gas outlet at the other.

It has already been proposed to construct such furnaces in the form of a horizontal truncated cone, the mojor base of which faces the fire, so that the furnace chamber tapers toward the gas-outlet end. These furnaces were lined in such a way that the smelting chamber was of circular cross section throughout.

The present invention brings about a substantial improvement in such furnaces, by

g means of which the heating and smeltingeffect is considerably increased. According to the invention, this improvement is obtained by giving the furnace, at least in that part of same which is nearest the fire, an elliptical or oval, instead of circular, form. The im provement produced by such cross sectional shape resides substantially in the resulting improved intermixing of the charge. During the rotation of the furnace, which preferably turns through 360, the surface of the molten bath, or the bath itself is compelled to spread out and contract in regular alternation being thereby subjected to considerable agitation and becoming more intimately intermingled than if the cross section were circular.

In order more clearly to understand the nature of the invention, reference is made to the accompanying drawings, which illustrate diagrammatically and by way of example, a typical embodiment of furnace according to the invent-ion, and in which Fig. 1 is a longitudinal section through the furnace, and

Fig. 2 a section along the line A-B, and Fig. 3 a section along the line 0-D. The furnace takes the form of a horizontal truncated cone. It is surrounded by an iron or steel shell 1, in the usual manner, and with a masonry or rammed lining 2. It runs, by means of rails 3, on wheels 4. The fire (not shown) is situated at 5 and is fed with oil, gas, pulverized coal or the like. The smaller end of the furnace has an axial opening 6 which serves both as the gas outlet and as the 490,989, and in Germany November 7, 1929.

charging opening. The tap hole 7 for the molten material is situated in the lowest point of the bath. According to the present invention, the lining is of elliptical cross section (Fig. 2) in the forward part, merging into a circular cross section in the direction of the gas outlet (Figs. 2 and The furnace can also be designed for blast, as by providing nozzles 8 which open into the furnace at or adjacent the plane of its major dimension. his embodiment gives the advantage that more rapid fusion is obtained, in the melting-down stage, with the ellipse in the horizontal position, owing to the larger exposed surface. l/Vith the ellipse turned up this advantage is increased owing to the fact that, during the blow, a greater depth of bath is presented to the blast gas (air or the like), and therefore more intensive blowing is obtained. Moreover, the smaller surface is advantageous in respect of the removal of slag and saving in covering material. For tapping, the furnace is rotated l80 from the position shown in Figs. 1 and 2.

I claim 1. Elongated tilting or rotary hearth furnace having the form of a horizontal truncated cone, in which the furnace is of elliptical or oval cross section, at least in that portion which is nearest the fire.

2. A tilting furnace comprising a shell having the form of a truncated cone, a lining within the shell and having an inner surface which is of elliptical cross-section at the larger end of the furnace, and means for introducing a blast at the plane of the major transverse dimension of the interior of the furnace.

3. The invention as set forth in claim 2, wherein, the interior surface of the lining varies from elliptical cross-section at the larger end of the shell to circular cross-section at the smaller end thereof.

In testimony whereof, I affix my signature.

HERMANN MASCHMEYER. 

